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Subject[PATCH net-next-2.6 4/17] can: EG20T PCH: Add Tx Flow Control
Add flow control processing.
Currently, there is no flow control processing.
Thus, Add flow control processing as
when there is no empty of tx buffer,
netif_stop_queue is called.
When there is empty buffer, netif_wake_queue is called.

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
---
drivers/net/can/pch_can.c | 37 +++++++++++++------------------------
1 files changed, 13 insertions(+), 24 deletions(-)

diff --git a/drivers/net/can/pch_can.c b/drivers/net/can/pch_can.c
index 5c21f5c..7c182b8 100644
--- a/drivers/net/can/pch_can.c
+++ b/drivers/net/can/pch_can.c
@@ -900,6 +900,8 @@ MSG_OBJ:
dlc = 8;
stats->tx_bytes += dlc;
stats->tx_packets++;
+ if (int_stat == PCH_TX_OBJ_END)
+ netif_wake_queue(ndev);
}

int_stat = pch_can_int_pending(priv);
@@ -1038,47 +1040,34 @@ static int pch_close(struct net_device *ndev)
return 0;
}

-static int pch_get_msg_obj_sts(struct net_device *ndev, u32 obj_id)
-{
- u32 buffer_status = 0;
- struct pch_can_priv *priv = netdev_priv(ndev);
-
- /* Getting the message object status. */
- buffer_status = (u32) pch_can_get_buffer_status(priv);
-
- return buffer_status & obj_id;
-}
-
-
static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
{
int i, j;
unsigned long flags;
struct pch_can_priv *priv = netdev_priv(ndev);
struct can_frame *cf = (struct can_frame *)skb->data;
- int tx_buffer_avail = 0;
+ int tx_obj_no = 0;

if (can_dropped_invalid_skb(ndev, skb))
return NETDEV_TX_OK;

- if (priv->tx_obj == PCH_TX_OBJ_END) { /* Point tail Obj */
- while (pch_get_msg_obj_sts(ndev, (((1 << PCH_TX_OBJ_NUM)-1) <<
- PCH_RX_OBJ_NUM)))
- udelay(500);
+ if (priv->tx_obj == PCH_TX_OBJ_END) {
+ if (ioread32(&priv->regs->treq2) & 0xfc00)
+ netif_stop_queue(ndev);

- priv->tx_obj = PCH_TX_OBJ_START; /* Point head of Tx Obj ID */
- tx_buffer_avail = priv->tx_obj; /* Point Tail of Tx Obj */
+ tx_obj_no = priv->tx_obj;
+ priv->tx_obj = PCH_TX_OBJ_START;
} else {
- tx_buffer_avail = priv->tx_obj;
+ tx_obj_no = priv->tx_obj;
+ priv->tx_obj++;
}
- priv->tx_obj++;

/* Attaining the lock. */
spin_lock_irqsave(&priv->msgif_reg_lock, flags);

/* Reading the Msg Obj from the Msg RAM to the Interface register. */
iowrite32(PCH_CMASK_RX_TX_GET, &priv->regs->ifregs[1].cmask);
- pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail);
+ pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_obj_no);

/* Setting the CMASK register. */
pch_can_bit_set(&priv->regs->ifregs[1].cmask, PCH_CMASK_ALL);
@@ -1110,7 +1099,7 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
(&priv->regs->ifregs[1].dataa1) + j*4);
}

- can_put_echo_skb(skb, ndev, tx_buffer_avail - PCH_RX_OBJ_END - 1);
+ can_put_echo_skb(skb, ndev, tx_obj_no - PCH_RX_OBJ_END - 1);

/* Updating the size of the data. */
pch_can_bit_clear(&priv->regs->ifregs[1].mcont, 0x0f);
@@ -1125,7 +1114,7 @@ static netdev_tx_t pch_xmit(struct sk_buff *skb, struct net_device *ndev)
pch_can_bit_set(&priv->regs->ifregs[1].mcont,
PCH_IF_MCONT_NEWDAT | PCH_IF_MCONT_TXRQXT);

- pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_buffer_avail);
+ pch_can_check_if_busy(&priv->regs->ifregs[1].creq, tx_obj_no);

spin_unlock_irqrestore(&priv->msgif_reg_lock, flags);

--
1.6.0.6


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